A riot police vehicle fires tear gas at protesters during a battle near Tahrir Square. One person was killed as demonstrators clashed with security forces following a state of emergency decree by Egyptian President Mohammed Morsi. Khalil Hamra, AP

A protester adjusts his goggles and mask before battling riot police near Tahrir Square in Cairo. Khalil Hamra, AP

A demonstrator throws a stone at a riot police vehicle. Khalil Hamra, AP

A protester flashes the victory sign during a battle with riot police. Khalil Hamra, AP